\[\boxed{\text{1055\ (1055).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[(x + 3)^{4} + (x + 5)^{4} = 4\]
\[Пусть\ \ a = x + 4,\ тогда\]
\[(a - 1)^{4} + (a + 1)^{4} = 4\]
\[2a^{4} + 12a² - 2 = 0\]
\[a^{4} + 6a^{2} - 1 = 0\]
\[Пусть\ a^{2} = c \geq 0,\]
\[c^{2} + 6c - 1 = 0\]
\[D = 9 + 1 = 10\]
\[c = - 3 \pm \sqrt{10},\]
\[c \geq 0 \Longrightarrow c = \sqrt{10} - 3;\]
\[a = \pm \sqrt{\sqrt{10} - 3},\]
\[x = a - 4 = \pm \sqrt{\sqrt{10} - 3} - 4.\]
\[Ответ:\ x = \sqrt{\sqrt{10} - 3} - 4;\ \ \ \ \ \]
\[x = \ - \sqrt{\sqrt{10} - 3} - 4.\]